动基座近舰面流场数值模拟

The major influence of ship awake on the landing for the carrier-based aircraft calls for studies on the characteristics of its flow field, and the analyses of the aerodynamic change of carrier-based aircraft in different airwakes. Thus, adopting overset mesh technique, a numerical simulation of UAV's landing in the heave of aircraft carrier is carried out. Firstly, the appropriate calculation method for the ship flow field is verified by comparing the simulation results of SFS2 with the experiment data. Secondly, by comparing the flow fields of single UAV in steady and unsteady conditions, the feasibility of overset mesh method for the landing of the UAV is verified. Next, the velocities of aircraft carrier's flow field at single phase flow and two-phase flow are compared. The results indicate that the flow under the deck does not significantly affect the velocity above the deck. Thus, the influence of water for aircraft carrier can be neglected and only the flow field in air is analyzed. The simulations show that the airwake of the aircraft carrier is significantly unsteady; the velocities of the landing track for a stationary ship shows more periodic fluctuation; and the fluctuation amplitude weakens with the increase of the distance from the ship. For the heave case, ship airwake becomes more complicated that the the periodic fluctuation of horizontal velocity fades, but the fluctuation amplitude of vertical velocity strengthens significantly. Meanwhile, for the stationary ship, the aerodynamic change of the UAV is different when landing at different times; for the ship in the heave motion, the lift and pitch moments of the UAV will demonstrate more fluctuations in a short period of time.